Abstract:
PURPOSE:A prior study showed that Toll-like receptor (TLR)-5 recognizes Pseudomonas aeruginosa flagellin and triggers the production of proinflammatory cytokines in human corneal epithelial cells (HCECs). The present study was conducted to determine how the inflammatory response is modulated after TLR activation in HCECs. METHODS:HUCL cells, a telomerase-immortalized HCEC line, and primary cultures of HCECs were pretreated with low-dose flagellin and then challenged, with either a high dose of flagellin or with Pseudomonas. NF-kappaB activation was determined by the extent of IkappaB-alpha phosphorylation and degradation and of nuclear p65 DNA binding. The amount of cytokines in the culture media was assessed by ELISA. The activation of p38 and JNK and the cellular expression of TLR5 were determined by Western blot analysis. Cell surface distribution of TLR5 was assessed by flow cytometry. The expression and secretion of antimicrobial peptides were assessed by semiquantitative RT-PCR and slot-blot analysis, respectively. RESULTS:Pre-exposure (12-24 hours) of HCECs to low-dose flagellin induced a state of tolerance, characterized by impaired activation of the NF-kappaB, p38, and JNK pathways and reduced production of IL-8 and TNF-alpha on subsequent challenge with a high dose of flagellin. Flagellin-induced tolerance did not alter the cellular level and surface distribution of TLR5. Furthermore, flagellin priming of HCECs dampened the inflammatory response of HCECs to live Pseudomonas. Pseudomonas-induced upregulation of antimicrobial genes such as hBD2 and LL-37 was augmented, even in tolerized HCECs. CONCLUSIONS:Pre-exposure of the ocular surface to TLR agonists may induce protective mechanisms that not only modulate the host inflammatory response but also provide an innate defense against bacterial infection in the cornea.
journal_name
Invest Ophthalmol Vis Scijournal_title
Investigative ophthalmology & visual scienceauthors
Kumar A,Yin J,Zhang J,Yu FSdoi
10.1167/iovs.07-0473subject
Has Abstractpub_date
2007-10-01 00:00:00pages
4664-70issue
10eissn
0146-0404issn
1552-5783pii
48/10/4664journal_volume
48pub_type
杂志文章abstract:PURPOSE:To analyze the mechanism of action of adrenomedullin (AM), a peptide recently isolated from human pheochromocytoma, in isolated canine central retinal arteries and to compare the action of calcitonin gene-related peptide (CCRP). METHODS:Changes in isometric tension were recorded in helical strips of the arteri...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1997-01-01 00:00:00
abstract:PURPOSE:We evaluated the roles of tumor necrosis factor (TNF)-α in alkali-induced corneal neovascularization (CNV). METHODS:CNV was induced by alkali injury and compared in wild-type (WT) BALB/c mice, and TNF receptor 1-deficient (TNF-Rp55 KO) counterparts, or in mice treated with TNF-α antagonist and recombinant TNF-...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
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abstract:PURPOSE:The epidermal growth factor receptor (EGFR) appears in astrocytes after neural injury. The authors' laboratory has reported the presence of EGFR in glaucomatous optic nerves. The activation of EGFR is often associated with induction of cyclooxygenase (COX)-2. In this study, the induction of COX-2 pathway in rat...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.04-1473
更新日期:2005-06-01 00:00:00
abstract::Nineteen hundred and seventy-six immature human cataracts extracted intracapsularly were classified according to the Cooperative Cataract Research Group (CCRG) method of cataract classification. Data on cataract location and extent, nuclear color, preoperative visual acuity, age, and sex were organized and stored in t...
journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1984-02-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.14-13931
更新日期:2014-04-28 00:00:00
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journal_title:Investigative ophthalmology & visual science
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doi:10.1167/iovs.09-3828
更新日期:2009-11-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:2000-01-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章,评审
doi:10.1167/iovs.18-24428
更新日期:2018-08-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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doi:
更新日期:1977-03-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2013-12-17 00:00:00
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journal_title:Investigative ophthalmology & visual science
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
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更新日期:2018-03-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1989-01-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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doi:10.1167/iovs.15-17299
更新日期:2015-08-01 00:00:00
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更新日期:2010-07-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:10.1167/iovs.14-15324
更新日期:2015-04-01 00:00:00
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doi:10.1167/iovs.09-3610
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journal_title:Investigative ophthalmology & visual science
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:1996-03-01 00:00:00
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更新日期:2002-05-01 00:00:00
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更新日期:2011-06-21 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1979-06-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1995-02-01 00:00:00
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更新日期:2011-02-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1989-04-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1980-01-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2012-12-13 00:00:00
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journal_title:Investigative ophthalmology & visual science
pub_type: 杂志文章
doi:
更新日期:1997-04-01 00:00:00
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journal_title:Investigative ophthalmology & visual science
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更新日期:2003-02-01 00:00:00